Debiting my account for a cancelled contract

My cell phone contract has ended in November 2020 and I am still being debited every single month. I have called, emailed, sent Facebook messages and even went into store 8 times with NO ASSISTANCE! I would like a refund for all the monies which were taken and answers from Telkom as to why they do this? For 2 years I have paid my contract on time without a murmur! Covid 19 has affected me financially and hence me not renewing my contract they feel the need to ***** from people who already don’t have! You guys are BIG business and you can’t even reply to your paying customers? You can’t even see you unfairly debiting someone whose contact ended 8 months ago? I want answers! It’s been a long frustrating 8 months with you I am NO LONGER TAKING THIS!